Mandrel-press.



N6; #417,174. PATENTED DEC. 15, 1903.

J. A. HESS.

MANDREL PRESS.

' APPLICATION FILED OCT. 18, 1901. HQ MODEL. 2 SHEETS-SHEET 1.

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Patented December 15, 1903.

Patent tribe.

JOHN A. HESS, OF PHILADELPHIA, PENNSYLVANIA.

MANDREL PRESS.

SPECIFICATION forming part of Letters Patent No. 747,174, dated December 15, 1903.

Application filed October 18, 1901. Serial No. 79,076. (No model.)

To all whom it may concern:

Be it known thatI, JOHN A. HESS, of the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Mandrel-Presses, of which the following is a specification.

My invention consists of a mandrel-press, the same being adapted for use in driving a mandrel into a hollow object to be operated upon any metal-working machine-for instance, an object that is to be turned on a lathe.

The object of my invention is to provide a device that can be set to drive a mandrel with the desired force according to the diameter of the opening in such object, so as to obviate any chance of splitting or enlarging such object.

The invention further consists of the details of construction, all as will be hereinafter fully set forth and claimed.

Figure 1 represents a side elevation of a mandrel-press constructed in accordance with my invention. Fig. 2 represents an end elevation thereof. Fig. 3 represents a top plan.

Fig. 4 represents a top plan of one of the arms that carry the rest supporting the object into which the mandrel is to be driven. Fig. 5 represents av perspective view of one of said rests. Fig. 6 represents a side elevation, on an enlarged scale, of the driving-pulley and accompanying parts, taken on the line a: a; of Fig. 7. Fig. 7 represents an end elevation thereof. on the line y y of Fig. l on an enlarged scale.

Fig. 9 represents a similar view of the upper port-ion thereof with the partsin their different positions. Fig. 10 represents a vertical section on the line 2 z of Fig. 8.

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, Adesignates the base of the press, its shape and plan being apparent from Fig. 3 and upon which are mounted the posts B, carrying the top piece 0. The top piece 0 is provided with abracket D near one end thereof and at about its center with the upright or guide E, across the upper end of which extends the horizontal hearing F, said guide E and bearing F being conveniently made in one piece or casting. The said bearing F is enlarged at its central per- Fig. 8 represents-a vertical sectiontion, and the driving-shaft G is therefore supported at the end portions of the bearing only, being provided at one end with a hand-wheel H, whereby it can be manually operated, and at its other end with a clutch member J, said hand-wheel and clutch member being fast upon the shaft G, and thus preventing longitudinal movement thereof in the hearing F. Loosely mountedupon the shaft G, adjacent the clutch member J, is the drivingpulley K, carrying at one side thereof the clutch face or member L. The said pulley K is also longitudinally movable upon the shaft G, so that the clutch members J and L can be engaged and disengaged, and this longitudinal movement of the pulley K is controlled by a collar H, longitudinally movable upon the shaft G and between which and the hub of the pulleyK are antifriction-balls N, situated in suitable races to reduce the friction between said parts. The collar M is grooved exteriorly to receive the fingers of a yoke P, said yoke being carried by a rockshaft Q, mounted in the bracket D. Mounted also upon said rock-shaft is a lever R, carrying a sliding weight S. The said lever is conveniently flat, as shown in Fig. 2, with the longitudinal rib extendingfrom its lower side, while the weight. S is recessed longitudinally to fit thereon, being also provided with ears T, which can be compressed upon the rib of the lever by means of a thumbscrew U to fasten the weight thereon at any particular point, it being noted that said lever is graduated or provided with a scale, as shown in Fig. l. The weight will thus cause the rock-shaft to turn and move the collar M and pulley K, so as to bring the clutch members J and L into engagement, the friction between said parts depending, of course, upon the proximity of the sliding weight to the rock-shaft.

The guide E intersects the bearing F and is open at its upper and lower ends, while mounted therein is a plunger W, through the upper end of which is an opening X, through which the shaft G and parts carried thereby pass. The portion of the shaft situated Within the opening X is provided with an eccentric Y, around which extends a collar Z, and surrounding the collar Z is a sleeve A, preferably thicker at its lower side, so

' the shaft.

that the socket B may be made therein without unduly weakening the same. The said socket receives the pivot O, that rests within a hardened plug D, set in the lower side of the opening X. At the upper end of the opening X is a follower E, controlled by a screw F, so that said followercan be held in contact with the upper side of the sleeve A to hold the same firmly in place. In the lower end of the plunger is a screw-threaded opening to receive the screw G, upon the lower end of which are the hammer H and the hand-wheel J, rigid therewith, and by means of which the screw can be turned.

The press is provided with an adjustable bed, so as to accommodate different sizes of work, the same consisting conveniently of a plurality of V-shaped' frames K, that are carried by arms L, pivotally mounted upon one of the posts B. The said frames K and arms L are of different thickness, so as to be readily adjusted to accommodate any-size work, as will be obvious from Fig. 1.

The operation is as follows: In Fig. 1 I have shown a hollow piece of work with a mandrel inserted therein in dotted lines, said mandrel simply resting within the work, while the work rests upon the upper V-shaped frame K.

By means of the hand-wheel H the shaft G is turned to bring the high part of the eccentric uppermost, as shown in Fig. 8. Then the hand-wheel J is operated to bring the lower end of the hammer H in contact with the upper end of the mandrel. It is understood, of course, that the pulley Kis being driven by its belt and is rotating freely upon the shaft G. The sliding weight S is then moved along the lever B to the point indicated by the scale upon said lever B corresponding with the diameter of the opening through the object into which the mandrel is to be driven. 1 The weight will depress the end of the lever in proportion to the distance between the weight and the fulcrum of said lever. This will cause the rock-shaft to turn and move the collar M and pulley K longitudinally upon the shaft and cause the clutch membersJand L to engage, and thereby turn This will turn the eccentric Y, andin moving to the position shown in Fig. 9 the plunger W and hammer H are also depressed, which will drive the mandrel into the work a distance equal to the pitch of the eccentric. As the shaft continues to rotate the plunger and hammer reciprocate, and then by turning the hand-wheel J the hammer can be gradually depressed to impart a continuous pressure upon the upper end of the mandrel and press the same into the work until it is sufficiently fast. The scale upon the lever Ris so proportioned relative to the diameter of the opening through the work that when the mandrel has been driven into the same with sufficient force the'leverage obtained by the weight will not be sufficient to hold the clutch members in contact with sufficient friction to cause the hammer to drive the mandrel anylongerthat is to say, the obstacle presented by the contact between the hammerand the mandrel at such a point will overcome the friction between the clutch members J and L, and the pulley K will again turn free upon the shaft. It is understood, of course, that if this piece of work is longer than that shown in dotted lines in Fig. 1 one or more of the frames forming the bed can be swung to one side, as shown in dotted lines in Fig. 3, to accommodate the same.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. Ina mandrel-press, a reciprocatory hammer, a shaft at an angle thereto and operatively connected therewith, frictional driving means for said shaft and means for holding the friction driving means in operative relation with a yielding pressure, said means being automatically rendered inoperative under predetermined conditions.

2. In a mandrel-press, a reciprocatory hammer, driving means therefor, a friction-clutch interposed between said driving means and said hammer and means arranged for cooperation with said clutch for holding the members thereof in contact with a yielding pressure, said clutch being rendered automatically inoperative by increased contact between the hammer and the mandrel.

3. In a mandrel-press, a reciprocatory hammer, driving means therefor, a friction-clutch interposed between said driving means and said hammer and means arranged for cooperation with said clutch for holding the members thereof in contact with a yielding pressure, said clutch being rendered automaticallyinoperative by increased contact between the hammer and the mandrel, and means for adjustment to vary the pressure required to render such means inoperative.

4. In a mandrel-press, a reciprocatory hammer, driving means therefor, afriction-clutch interposed between the said driving means and said hammer, and means controlled by the contact between the hammer and the mandrel for automatically rendering the friction-clutch inoperative.

5. In a mandrel-press, a reciprocatoryhammer, driving means therefor, a friction-clutch interposed between the said driving means and said hammer for driving the latter, a lever controlling said clutch, an interposed rock-shaft for operating the clutch, adjustable means for varying the power of said lever to render the clutch inoperative at predetermined times governed by the contact of the hammer with the mandrel.

6. In a mandrel-press, areciprocatory hammer, driving means therefor, means fordriving the same embodying a friction-clutch interposed between the said driving means and said ham mer, a lever controlling said clutch, a weight adjustable on said lever and manual means for gradually depressing the hammer.

7. In a mandrel-press, a reciprocatory hammer, a shaft at right angles thereto with means for actuating the hammer, a longitudinally-movable loose pulley upon said shaft, coacting clutch members carried by said shaft and pulley, a rock-shaft connected with the loose pulley for actuating the same, a lever connected with said rock-shaft, and aweight adjustable on said lever.

8. In a mandrel-press, a reciprocatory hammer, a shaft at right angles thereto with means for actuating the hammer, a longitudinally-movable loose pulley upon said shaft, coacting clutch members carried by said shaft and pulley, a rock-shaft connected with the loose pulley for actuating the same, a lever connected with said rock-shaft, and a Weight adjustable on said lever, said lever being provided with a scale proportioned relative to the diameter of the opening through the Work.

9. In a mandrel-press, a driving shaft, frictional devices controlling the same, an eccentric upon said shaft, a collar upon said eccentric, a sleeve surrounding said collar, a plunger provided with an opening through which said shaft passes and against the lower side of which said sleeve bears, and a hammer carried bysaid plunger.

10. In a mandrel-press, a driving-shaft, frictional devices controlling the same, an eccentric upon said shaft, a sleeve carried by said eccentric, a plunger having an opening therethrough, through which the shaft passes, said sleeve being situated within said opening, a follower at the upperend of said opening, adapted to bear upon the upper side of said sleeve, a pivot at the lower side of said opening upon which said sleeve rests, and a hammer carried by said plunger.

11. In a mandrel -press, a reciprocatory hammer, and a bed consisting of a plurality of pivotally-mounted movable frames.

12. In a mandrelpress, a reciprocatory l hammer, and a bed consisting of a plurality of movable frames of difierent heights.

13. Ina mandrel-press, a base, posts thereon, a reciprocatory hammer and means for operating the same mounted upon the upper ends of said post and a plurality of movable frames forming a bed swingingly mounted upon one of said posts.

14. In a mandrel-press, a frictionally-driven hammer, a driving-shaft at an angle thereto, means to drive the same, and means for'automatically rendering said driving means inoperative when a predetermined pressure on the mandrel is reached.

15. In a mandrel' press, a hammer, frictionaldriving means therefor and means governing the operative connection between the members of said driving means, said means being adjusted and controlled by the resistance offered to the mandrel.

16. In a mandrel-press, africtionally-driven hammer, means for limiting the pressure of the hammer on the mandrel as it is being driven and means cooperating with said firstmentioned means for adjusting the same according to the resistance ofiered to the hammer.

17. In a mandrel press a reciprocatory hammer, a shaft at an angle thereto and traversing the same, means on said shaft for frictionally driving the same and means also on said shaft for actuating the hammer, a pivotally-mounted graduated lever connected with the friction driving means and a weight adjustable on said lever.

18. In a mandrel press a recipr'ocatory hammer, a shaft at an angle thereto and traversing the same, means on said shaft for frictionally driving the same and means also on said shaft for actuating the hammer, a pivotally-mounted graduated lever connected with the friction driving means and a weight adjustable on said lever, means for automatically rendering the driving means inoperative to rotate said shaft, by the resistance offered to the hammer, and means for gradually depressing the hammer.

19. In a mandrel-press, the combination with a reciprocatory hammer, a plunger in which the same is rotatably mounted, a guide for the plunger, said plunger having a transverse opening, a shaft passed through said opening, friction means for driving said shaft,

a cam on the shaft within said opening, a collar surrounding said cam, and a sleeve surrounding said collar, a hardened plug in the plunger and a cylindrical member seated in said plug and in the socket in the said collar.

20. In a mandrel-press, the combination with a reciprocatory hammer, a plunger in which the same is rotatably mounted, a guide for the plunger, said plunger having a transverseopening, a shaft passed through said opening, friction means for-driving said shaft, a cam on the shaft Within said opening, a collar surrounding said cam, and a sleeve surrounding said collar, a hardened plug in the plunger and a cylindrical member seated in said plug and in the said collar, and a fol lower bearing on the upper portion of said collar and having means for its adjustment.

JOHN A. HESS.

Witnesses:

WM. CANER WIEDERSHEIM, (J. D. MOVAY.

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